Nearing the end of day 1 and I've made pretty good progress. Here's a list:
- Basic dragon lair generation. It has an open center, lava rivers, lava pools, gold piles, and rocks.
- Static and dynamic light. Lava emits static light after generating the lair, the player and dragonlings emit dynamic light.
- Turn system. Very basic, you move, others move.
- Basic stats. Health and anxiety can delete you (nothing else happens). Anxiety steadily increases, health goes down when walking over lava.
- Gold pickup. Restores anxiety.
- Wandering dragonlings. Right now they just emit a small amount of light and walk randomly.
- Rocks and bumping mechanics. You can push rocks over lava to fill it in.
Here's a few screenshots:

...

Building a bridge of rocks.